public class assigningoperatordemo1 {
    public static void main(String[] args) {
        //+=
        //规则:将左边和右边进行相加,然后再把结果赋值给左边
        int a = 10;
        int b = 20;
        a += b ;
        System.out.println(a);
        System.out.println(b);
    }
}
